#include <conio.h>
void swap(const int &a, const int &b)
{
	int temp = a;
	a = b; //error
	b = temp; //error
}
int main()
{
	int x = 5;
	int y = 6;
	swap(x, y);
	cout << x << y;
	return 0;
	_getch();
}